//
//  CZWelcomeViewController.swift
//  iOSWeibo10
//
//  Created by ge on 16/5/14.
//  Copyright © 2016年 ge. All rights reserved.
//

import UIKit
import SnapKit
import SDWebImage

class CZWelcomeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        prepareUI()
        
        // 即使头像在本地缓存了图片,刚开始会用占位图片,只有网路请求完成后才会使用SDWebImage设置图片
        // 解决方法,在获取用户信息之前,也使用SDWebImage去设置一下头像的图片
        setIcon()
        
        // 获取用户信息
        CZUserAccountViewModel.sharedInstance.loadUserInfo { () -> () in
            self.setIcon()
        }
    }
    
    //设置头像
    private func setIcon() {
        if let avatar_large = CZUserAccountViewModel.sharedInstance.userAccount?.avatar_large {
            // 获取到了用户数据,设置头像
            let url = NSURL(string: avatar_large)!
            self.iconView.sd_setImageWithURL(url, placeholderImage: UIImage(named: "avatar_default_big"))
        }
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        // 在用户看的到界面的时候在调用动画
        moveAnimation()
    }
    
    // 移动动画
    private func moveAnimation() {
        //UIView动画
        // 弹簧动画
        // usingSpringWithDamping: 弹簧的明显程度 0 - 1
        // initialSpringVelocity: 初始速度
        UIView.animateWithDuration(1, delay: 0.1, usingSpringWithDamping: 0.5, initialSpringVelocity: 5, options: UIViewAnimationOptions(rawValue: 0), animations: { () -> Void in
            
            // 要做动画
            // snp_updateConstraints: 更新约束
            self.iconView.snp_updateConstraints(closure: { (make) -> Void in
                // 更新底部约束
                make.bottom.equalTo(self.view).offset(-(UIScreen.mainScreen().bounds.height - 160))
            })
            
            // 根据约束重新设置frame值
            self.view.layoutIfNeeded()
            
            }) { (_) -> Void in
                
                CZPrint(items: "弹簧动画完成, label渐变动画")
                UIView.animateWithDuration(0.5, animations: { () -> Void in
                    self.messageLable.alpha = 1
                    }, completion: { (_) -> Void in
                    
                        // 切换到MainViewController
                        let appDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
                        appDelegate.switchRootController(CZMainTabBarController())
                })
        }
    }
    
    private func prepareUI() {
        // self.view添加子控件
        view.addSubview(bkgView)
        view.addSubview(iconView)
        view.addSubview(messageLable)
        
        // autolayout
        // 背景
        // bkgView: 要添加约束的view
        // snp_makeConstraints: 要添加约束
        // make: 要添加约束的view
        bkgView.snp_makeConstraints { (make) -> Void in
            // 填充父控件
            make.edges.equalTo(self.view)
        }
        
        //头像
        iconView.snp_makeConstraints { (make) -> Void in
            // make.centerX: 要约束view的centerX属性
            // equalTo: 参照
            // self.view: 参照的view
            // snp_centerX: 参照View的哪个属性, 参照view的属性需要添加snp_
            //            make.centerX.equalTo(self.view.snp_centerX)
            make.centerX.equalTo(self.view) // 当要约束的约束和参照的约束一样的时候,参照的约束可以省略
            make.bottom.equalTo(self.view).offset(-160)
            make.size.equalTo(CGSizeMake(85, 85))
        }
        
        // 消息label
        messageLable.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(iconView)
            make.top.equalTo(iconView.snp_bottom).offset(16)
        }
    }

    // MARK: - 懒加载
    /// 背景
    private lazy var bkgView: UIImageView = UIImageView(image: UIImage(named: "ad_background"))
    
    //头像
    private lazy var iconView: UIImageView = {
        let imageView = UIImageView(image: UIImage(named: "avatar_default_big"))
        
        //圆角
        imageView.layer.cornerRadius = 42.5
        imageView.layer.masksToBounds = true
        
        return imageView
    }()
    
    //消息label
    private lazy var messageLable: UILabel = {
        let label = UILabel()
        
        //设置label
        label.text = "欢迎归来"
        label.textColor = UIColor.blackColor()
        label.font = UIFont.systemFontOfSize(15)
        label.sizeToFit()
        
        label.alpha = 0
        
        return label
    }()
    
    
}
